Improvement in spring-beams to plows



W. MORRISON.

Plow.

Patented Sept. 17. 1850.

PATENT OFFICE.

WM. MORRISON, OF GARLISLE, PENNSYLVANIA.

IMPROVEMENT l-N SPRING-BEAMS TO FLOWS.

Specification forming part 'of Letters Patent No. 7,656,

To all whom it may concern:

Be it known that I, WILLIAM -MORRISON, of Carlisle, in the county ofOumberland and State of Pr-nnsyl Vania, have inveu ted certain new and useful Improvements in Plows, of which the following is a fnll,"clear, and exact description, reference being bad to the accompanyin g drawings', which form part of this specification, and in which- Figure 1 represents a view in perspective of my plow, and Figs. 2, 3, and 4 are views of detached parts of the same.

My plow is of that class known as plows; and my invention consists in a spring draft-bar, to which the team is hitched, and in the method of attaching the plow-irons to their respective beams.

My plow in this instance is constructed with three sets of irons, A A A, which are each secured to a separate beam, B B B, the beams being all united at their front extremities, and their hinder extremities, diverging from each .other, are suitably braced, so as to form a triangular frame. Two handles, a, are secured to this frame, by which the plow is directed. The plowclevis b, to which the team is hitched, is attached to the front extremity ofa draft-bar, C. The latter is composed of two rigid pieces, cc, connected by a spring-plate. The front piece, 0, is the longer of the two, and'projects snfliciently in front of the frame to place the clevis or point of draft at a proper distance from the plowshare. The hinder extremity of this rigid bar 0 and the lower side of the binder piece, 0, are rounded-,to allow them to rock as the springplate is'flexed. The latter is secured to the rigid pieces by bolts or rivets and straps.

- The compound draft-bar thus formed is attached to the frame in the following manner: Two standards, e e, are erected on the central beam,and aslotis made in the hinderextremity of the front piece, 0, and another through the middle ot the hinder piece,.c, through which the'standards pass. The latter are perforated with a series of holes to receive pins '5 'i, by changing the position of which the angle of draftmay be varied in a vertical direction. The adjustment of the draft in a horizontal direction is eflected by the clevis in the usual 1118111161.

gangdated September 17, 1850.

The spring draft-bar thus described renders the plow to a certain degree self-adjusting. Thus, when from the hard nature of the ground the frontof the share would naturally rise, the spring, bending under theincreased resistance, directs the point. pownward and forces it to run at its proper distance from the surface, while in soft ground, where the point of the share would naturally tend to descend, the tenposed to this tendency, and thus prevents the allowing the plow to yield when the shares come suddenly in,contact with stones, and at the same time reduces the shock upon the shoulders of the animals by whom the plow is drawn.

The plow-irons (more fully represented in Figs. 2 and 3) are attached to their respective beams by two bolts. The bolt 9 is short, and is passed through a hole made in the upper part of the piece forming the mold-board and landside. The other or king bolt, h, is long, and performs three oflices. First, itsecures the share to the mold-board and landside; second, it forms the shin of the plow; and, third, itacts, in combination with the shorter bolt, 9, to secure the whole to the beam. may perform these functions it is made sharp at its front, and with a flaring head, Ia, which is received in a countersunk hole in the share.

tions, it is obvious that plows constructed in this manner can be furnished at a lower cost, while at the same time the position of the not of the bolt is such that it can be easily screwed up when necessary, and is not liable to loosening by coming in What I claim as my invention, and'desire to secure by Letters Patent, is- I The adjustable spring-bar, interposed between the poiut of draft and the frame of the plow,in the manner and for the purpose herein set forth.

WILLIAM MORRISON.

Witnesses W. M. Pmmosn,

J os. LEE, Sr.

sive force of the spring-plate is continually opshares from descending below certain limits. It also diminishes the liability to breakage by In order that it' As this bolt thusperforms three distinct tune-- contact with obstructions. 

